PatchTheCVECVE-2026-112778: Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotat
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Routine
HIGH 8.8UPGRADE
CVE-2026-112778 is a high-severity flaw (CVSS 8.8) affecting traefik. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotations in the Kubernetes Ingress provider, allowing references to Middlewares, ServersTransports, and TLSOptions in other namespaces. Attackers able to create or update Ingress or Service resources in one namespace can set router.middlewares or service.serverstransport annotations to obtain another tenant's injected credentials or reuse its
Why this priority
- High severity
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.2% (top 92%) |
| CISA exploited list | No |
| Weakness | CWE-862 |
| Published | 2026-10-19 |
| Last modified | 2026-10-23 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
traefik traefik UPGRADE
Affected: < 2.11.46 · >= 3.0.0 and < 3.6.16 · 3.7.0
Fixed in: 2.11.46, 3.6.16
Safe to downgrade to: a release before 3.0.0
1. Check installed version
apt-cache policy traefik || rpm -q traefik || traefik --version
2. UPGRADE to 2.11.46 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade traefik
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade traefik
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)
apt-cache madison traefik
sudo apt install traefik=<VERSION_BEFORE_3.0.0>
sudo apt-mark hold traefik
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list traefik
sudo dnf downgrade traefik-<VERSION_BEFORE_3.0.0>
sudo dnf versionlock add traefik
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Exact fixes by distribution
Fedora 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source
sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.